jphone,
I am well aware that one person can supervise for multiple agencies at the same time – that was not the issue. Additional chumros are not the issue either.
The issue here is simple: A box without a hechsher on it had a sticker on it certifying it as kosher by a person who did not visit the plant or send a representative to the plant – nor did he check with the Rav of the certifying agency.
If I remember all the details correctly, the product in question was at one time NOT kosher do to the source of the dye that was used. Additionally, other products manufactured in the plant are not kosher. What is he relying upon to put his sticker on the product? a list on the Company website?
The real question is: How is this “sticker” Rabbi going to know if any changes were made to the product without at a minimum making a phone call to the Supervising Rav?